<template>
  <div>
    <div class="shopcart">
      <div class="content">
        <div class="content-left" @click="toggleShow">
          <div class="logo-wrapper">
            <div class="logo " :class="{highlight:totalCount}">
              <i class="iconfont icon-shopping_cart" :class="{highlight:totalCount}"></i>
            </div>
            <div class="num" v-show="totalCount">{{totalCount}}</div>
          </div>
          <div class="price highlight">￥{{totalPrice}}</div>
          <div class="desc">另需配送费￥{{info.deliveryPrice}} 元</div>
        </div>
        <div class="content-right">
          <div class="pay" :class="payClass">
            {{payText}}
          </div>
        </div>
      </div>
      <transition name="move">
        <div class="shopcart-list" v-show="isShow">
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="clearCart">清空购物车</span>
          </div>
          <div class="list-content">
            <ul style="margin:0px;padding: 0px">
              <li class="food" v-for="(food,index) in cartFoods" :key="index" style="list-style: none">
                <span class="name">{{food.name}}</span>
                <div class="price"><span>￥{{food.price}}</span></div>
                <div class="cartcontrol-wrapper">
                  <CartControl :food="food"/>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>

    </div>
    <div class="list-mask" v-show="isShow" @click="toggleShow"></div>
  </div>
</template>

<script>
import {mapState,mapGetters} from 'vuex'
import CartControl from "@/components/CartControl/CartControl";
import { MessageBox,Toast } from 'mint-ui';
import BScroll from '@better-scroll/core'
export default {
  name: "ShopCart",
  components:{
    CartControl
  },
  data(){
    return{
      isShow:false
    }
  },
  computed:{
    ...mapState(['cartFoods','info']),
    ...mapGetters(['totalCount','totalPrice']),
    payClass(){
      const {totalPrice} = this
      const {minPrice} = this.info
      return totalPrice >= minPrice ? 'enough' : 'not-enough'
    },
    payText(){
      const {totalPrice} = this
      const {minPrice} = this.info
      if(totalPrice === 0){
        return `￥${minPrice}元起送`
      }
      else if (totalPrice < minPrice){
        return `还差￥${minPrice - totalPrice}元起送`
      }
      else{
        return '去结算'
      }
    }
  },
  methods:{
    toggleShow(){
      if(this.totalCount === 0){
        Toast({
          message: '购物车里还没有东西哦，去看看吧',
          position: 'bottom',
          duration: 1500
        });
        console.log('执行了Toast')
      }
      else{
        this.isShow = !this.isShow
      }
    },
    clearCart(){
      MessageBox.confirm('确定清空购物车吗？').then(action => {
        this.$store.dispatch('clearCart')
      });
    }
  },
  watch:{
      //监听store中的数据
    //"$store.state.cartFoods":{
    //  deep:true,
    //  handler(newValue,oldValue){
    //    console.log('购物车中的数据被修改了',newValue,oldValue)
    //    console.log('##',this.$store.state.cartFoods)
    //  },
    //  immediate:true
    //},

    //监视totalCount中的数据变化
    totalCount:{
      handler(newValue,oldValue){
        //console.log('购物车数量',newValue,oldValue)

        //当totalCount=0时，改变isShow的值
        if(newValue === 0){
          this.isShow = false
        }
      }
    },
    isShow:{
      handler(newValue,oldValue){
        if(newValue){
          this.$nextTick(()=>{
            //实现BScroll的实例是一个单例子
            if(!this.scroll){
              this.scroll = new BScroll('.list-content',{
                click:true
              })
            }else{
              this.scroll.refresh() //让滚动条刷新一下：重新统计内容高度
            }

          })
        }
      }
    }
  }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import "../../common/stylus/mixins.styl"
.shopcart
  position fixed
  left 0
  bottom 0
  z-index 50
  width 100%
  height 48px
  .content
    display flex
    background #141d27
    font-size 0
    color rgba(255, 255, 255, 0.4)
    .content-left
      flex 1
      .logo-wrapper
        display inline-block
        vertical-align top
        position relative
        top -10px
        margin 0 12px
        padding 6px
        width 56px
        height 56px
        box-sizing border-box
        border-radius 50%
        background #141d27
        .logo
          width 100%
          height 100%
          border-radius 50%
          text-align center
          background #2b343c
          &.highlight
            background $green
          .icon-shopping_cart
            line-height 44px
            font-size 24px
            color #80858a
            &.highlight
              color #fff
        .num
          position absolute
          top 0
          right 0
          width 24px
          height 16px
          line-height 16px
          text-align center
          border-radius 16px
          font-size 9px
          font-weight 700
          color #ffffff
          background rgb(240, 20, 20)
          box-shadow 0 4px 8px 0 rgba(0, 0, 0, 0.4)
      .price
        display inline-block
        vertical-align top
        margin-top 5px
        line-height 24px
        padding-right 12px
        box-sizing border-box
        font-size 16px
        font-weight 700
        color #fff
        &.highlight
          color #fff
      .desc
        display inline-block
        vertical-align bottom
        margin-bottom 15px
        margin-left -45px
        font-size 10px
    .content-right
      flex 0 0 105px
      width 105px
      .pay
        height 48px
        line-height 48px
        text-align center
        font-size 12px
        font-weight 700
        color #fff
        &.not-enough
          background #2b333b
        &.enough
          background #00b43c
          color #fff
  .ball-container
    .ball
      position fixed
      left 32px
      bottom 22px
      z-index 200
      transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
      .inner
        width 16px
        height 16px
        border-radius 50%
        background $green
        transition all 0.4s linear
  .shopcart-list
    position absolute
    left 0
    top 0
    z-index -1
    width 100%
    transform translateY(-100%)
    &.move-enter-active , &.move-leave-active
      transition transform 0.3s
    &.move-enter, &.move-leave-to
      transform translateY(0)
    .list-header
      height 40px
      padding 0 18px
      background #f3f5f7
      border-bottom 1px solid rgba(7, 17, 27, 0.1)
      .title
        float left
        font-size 14px
        color rgb(7, 17, 27)
      .empty
        float right
        font-size 14px
        color rgb(0, 160, 220)
    .list-content
      width: 100%;
      padding 0 18px
      max-height 217px
      overflow hidden
      background #fff
      .food
        position relative
        padding 12px 0
        box-sizing border-box
        bottom-border-1px(rgba(7, 17, 27, 0.1))
        .name
          line-height 24px
          font-size 14px
          color rgb(7, 17, 27)
        .price
          position absolute
          right 90px
          bottom 12px
          line-height 24px
          font-size 14px
          font-weight 700
          color rgb(240, 20, 20)
        .cartcontrol-wrapper
          position absolute
          right 0
          bottom 6px
.list-mask
  position fixed
  top 0
  left 0
  width 100%
  height 100%
  z-index 40
  backdrop-filter blur(10px)
  opacity 1
  background rgba(7, 17, 27, 0.6)
  &.fade-enter-active , &.fade-leave-active
    transition opacity 0.3s
  &.fade-enter , &.fade-leave-to
    opacity 0
/*background rgba(7, 17, 27, 0)*/
</style>
